中文摘要：

沉降器内汽提油气的冷凝是造成重油催化裂化装置沉降器结焦的根本原因。为了分析待生剂吸附油气的性质变化,首先通过在线取样获得两段提升管催化裂化装置不同提升管内待生剂,用甲苯抽提提取待生剂上吸附的烃类并进行性质分析;然后在模拟汽提实验装置上进行待生剂的模拟汽提实验,分析汽提过程中的化学反应;最后将汽提油气中的液相组分进行二次热转化实验,探索汽提油气在沉降器稀相空间的热转化行为。结果表明,二段提升管待生剂吸附油气较多,馏程偏重,饱和分和氢含量很低;汽提过程中的化学反应以热裂化为主,二段待生剂吸附油气的反应较弱,重油收率较高,而且经过二次热裂化反应后,二段汽提油气重油收率仍然高于50%。因此二段提升管待生剂汽提油气会对两段提升管催化裂化沉降器的结焦产生重要影响。

英文摘要：

Condensation of stripped hydrocarbons is the root cause of coking in the disengager of a fluid catalytic cracking unit.To analyze the property changes of stripped hydrocarbons,on-site sampling at an industrial two-stage riser fluid catalytic cracking（TSRFCC）plant was performed to get the spent catalysts from various risers.The spent catalyst was extracted with toluene as solvent to obtain adsorbed hydrocarbons,which were analyzed by various methods.The spent catalyst from riser was also stripped with steam as a medium,and the chemical reactions in stripping were investigated.The liquid of stripped hydrocarbons was gathered to carry out thermal cracking experiment to simulate the reaction in dilute phase zone in the disengager.The spent catalyst from2 nd riser contained more adsorbed hydrocarbons with high distillation range and lower saturate and hydrogen contents.Thermal cracking is the dominant chemical reaction in the stripping process.Yield of heavy oil was higher in the stripping of the 2 nd riser spent catalyst due to the lower crackability of the adsorbed hydrocarbons.After secondary thermal cracking,the heavy oil yield of stripped hydrocarbon from the 2 nd riser spent catalyst was still over 50%.Therefore,stripped hydrocarbon from the 2 nd riser spent catalyst had a remarkable effect on coking in the disengager of the TSRFCC unit.